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  1. #1
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    Johnson V4 Crossflow recirculation system

    OMC recirculation system that is on v4 Crossflows.....what does it do, and what would happen if it was removed/plugged?

    On my motor (V4 1980 Crossflow) i have 4 check valves (Plastic ones mot brass as the norm) they are on the intake manifold below each carb.

    The check valves hoses lead to each by pass cover.


    Are these needed ? i have read that they help idling but i will be fitting CCM reeds so can i do away with these ?
    Last edited by spybot; 12-09-2017 at 06:55 AM.

    I love my Bikini

  2. #2
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    I have mine all pluged with a rubber cap on my motor and actually got some plugs for it as on one of my motors had the brass check valve and someone tried to solder it closed but it didnt completely plug it up. The threads are 1/4 pipe thread, you can get those plugs and do that to all of them as well. I think it was an EPA thing to try and drain extra oil/gas back into the motor to be burnt and not drip into the water.

    1973 Viper w/ V4 Crossflow.
    1978 Viking w/ 1978 175hp Merc, My first restoration in progress

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  4. #3
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    Did you notice any issue with slow speed loading etc or doesn't apply to your usage?

  5. #4
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    Thanks RJ just the info i was looking for. Thats a good question FMP. Did the slow speed get effected ?

    I love my Bikini

  6. #5
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    Quote Originally Posted by FMP View Post
    Did you notice any issue with slow speed loading etc or doesn't apply to your usage?
    Never had a motor with them in use. I was told they were just for EPA regulations. Older crossflows do not have them at all.

    1973 Viper w/ V4 Crossflow.
    1978 Viking w/ 1978 175hp Merc, My first restoration in progress

  7. #6
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    Quote Originally Posted by rjdubiel View Post
    . The threads are 1/4 pipe thread, you can get those plugs and do that to all of them as well.
    Anyone know what the UK equivalent is in BSP ?

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  8. #7
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    Not an EPA thing.
    '71 Glastron V153 - Composite rebuild - Unceremoniously wrecked
    '81 Baja 15 SS - "nine-paged" '77 140
    '81 Carlson C500 Metric - Currently in foster care
    '70 something Speedcraft - Allison 16R clone - Undergoing restoration
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    WALK TALL AND CARRY A BIG BILGE PUMP

  9. #8
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    Quote Originally Posted by 71V153 View Post
    Not an EPA thing.
    What does it do?

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  10. #9
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    makes them idle properly

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  12. #10
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    Quote Originally Posted by powerabout View Post
    makes them idle properly
    In what way ?
    If i add CCMS reeds will they not do the job better ?

    I love my Bikini

  13. #11
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    its called the puddle drain system.
    it is designed to drain ( pumped via one way valves) any fuel away that puddles after the reeds at low speed and feed it back into the engine in a manageable way.
    It was changed over the years to make it work better.

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  15. #12
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    OK i understand it now. I will have to look for two new plastic ones as two of mine dont work. May even have to bite the bullet and order 4 of the brass ones at 150

    I love my Bikini

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